Front vs Back Imprints: How Two-Sided Pill Codes Work

Turn a tablet over and you will often find a second code on the back that is different from the one on the front. This is normal, and it confuses a lot of people the first time they try to identify a pill. This guide explains how two-sided imprints work and how to enter them correctly.

Why the two sides differ

An imprint has to identify both the medicine and the company behind it. Makers often split that job across the two faces of a tablet: one side may carry the company name or logo plus a product number, while the other side carries the strength or a shorter product code. A very common layout is the company name on one side and a number such as "500" — the strength in milligrams — on the other. Neither side alone is the whole identity; together they are.

Scored tablets add another variation: the back may carry nothing but the score line itself, or a code arranged around it. Capsules print differently again — half the code usually sits on the cap and half on the body, so the full imprint only makes sense when the two halves are read together.

How the FDA label records it

On the FDA label, the imprint is written as one combined string, with the parts separated by a semicolon or a space. That is why our database shows imprints in "parts" — for example, a pill recorded as 832;50 has "832" on one side and "50" on the other. The label does not always say which part is on the front, and for identification it does not matter: the combination is what is unique.

How to enter a two-sided imprint

• Write down both sides in full, including any logo or symbol, then enter the whole thing into the identifier. Spaces and separators do not matter — our search treats "832 50", "832;50" and "83250" as the same code.
• If you can only read one side clearly, enter that part plus the colour and shape; then check the results against the other side of your pill.
• For capsules, read the cap and the body separately and combine them.
• Watch for characters split by a score line — a groove can make one letter look like two.

The trap: two pills, one shared side

Because one side often carries only a strength number, different medicines can share a back-side code — many unrelated tablets carry a plain "10" or "500". Never identify a pill by one side alone. Compare the full imprint from both sides, plus colour, shape and size, against the label record. If everything matches, the result matches the FDA label for that medicine — and a pharmacist can confirm it in person before anyone relies on it.

Try it now: enter the full code — both sides — into the pill identifier.